Where does “サイクロイド” come from?

サイクロイド (Japanese) comes from English cycloid, from English -oid, from Latin -oides, from Greek -ο, from Ancient Greek εἶδος, from Spanish -scopio, from Latin -scopium, from Ancient Greek σκοπέω — to see, to look, to observe.

サイクロイド (Japanese): a cycloid

Definitions

a cycloid

Ancestry of “サイクロイド”, step by step

Step	Language	Word	Meaning
1	English	cycloid	The locus of a point on the circumference of a...
2	English	-oid	Of similar form to, but not the same as. Having...
3	Latin	-oides	-like, -form
4	Greek	-ο	ending for "accusative singular" forms ; and some...
5	Ancient Greek	εἶδος	That which is seen: form, image, shape;...
6	Spanish	-scopio	-scope
7	Latin	-scopium	—
8	Ancient Greek	σκοπέω	I look, look at, behold; I examine, inspect; 413...
9	Ancient Greek	σκοπός	watcher, lookout; protector, guardian; spy, scout
10	Ancient Greek	σκέπτομαι	I look at, examine; I examine, consider, think
11	Proto-Hellenic	sképťomai	to look at
12	Proto-Indo-European	spéḱyeti	to be looking at, to keep looking at
13	Proto-Indo-European	speḱ-	to see, to look, to observe

Every word from Proto-Indo-European speḱ- →